Deflection method and deflection device for a strip, especially a metal strip

ABSTRACT

The invention relates to a deflection method for deflecting a strip ( 3, 8 ), especially a metal strip ( 3, 8 ), from an initial guide channel ( 5 ) to a final guide channel ( 9 ) which runs next to said initial guide channel ( 5 ). When passing through the initial guide channel ( 5 ), the strip ( 3, 8 ) comprises an underside (II) which faces away from the final guide channel ( 9 ) and has an upper side (I) which faces toward the final guide channel ( 9 ). In order to support the deflection of the metal strip ( 3, 8 ) from the initial guide channel ( 5 ) to the final guide channel ( 9 ), the invention provides that the strip ( 3, 8 ) is subjected to the action of a medium ( 12 ) on the underside (II) thereof during the deflection. The invention also relates to a corresponding deflection device.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a deflection method for a strip, inparticular, a metal strip, from an initial guide channel into a finalguide channel which runs next to the initial guide channel, wherein thestrip, when passing through the initial guide channel, has an upper sidefacing the final guide channel and an underside facing away from thefinal guide channel, as well as a deflection device correspondingthereto.

2. Description of the Related Art

When continuously winding strips, in particular, metal strips, theleading end of a following strip must be guided to a different hasp thanthe end of the preceding strip. The strip must therefore be guided froman initial guide channel into a final guide channel. Whether for thenext strip change a change back to the initial guide channel takesplace, as is the case for a multi-hasp device, or whether a change fromthe initial guide channel into the final guide channel must again beperformed, as in the case of a rotor or reversing hasp, is of noconsequence within the context of the present invention.

The known deflection devices operate substantially satisfactorily butcould still be improved upon.

SUMMARY OF THE INVENTION

The object of the present invention resides in that the prior artdeflection methods or the prior art deflection devices are to beimproved.

In correspondence thereto, the deflection device has a lower loadingdevice for loading the underside of the strip with a medium.

The medium can be, for example, compressed air or water that is underpressure.

When the deflection device comprises a drive device with an upper driveroll and a lower drive roll, wherein the upper drive roll acts on theupper side and the lower drive roll on the underside, and wherein thelower drive roll has a lower stripper bar for separating the strip fromthe lower drive roll, the first loading device is preferably arranged onthe lower stripper bar.

In the case of a rotor hasp the presence of the upper loading device issufficient. In the case of a multi-hasp device, on the other hand, thedeflection device should have also a second loading device for loadingthe underside of the strip with the medium so that the return of thestrip from the final guide channel into the initial guide channel canalso be assisted by loading with the medium.

The upper loading device is also preferably arranged on an upperstripper bar for removing the strip from the upper drive roll, shouldsuch an upper stripper bar be present.

The initial guide channel and the final guide channel are, in general,separated from one another by a switch. The switch can have a pointedtip. Preferably, the tip is however rounded. It is especiallyadvantageous to have a rounded tip which is rotatably supported.

BRIEF DESCRIPTION OF THE DRAWING

Further advantages and details result from the other claims as well asthe following description of one embodiment. It is shown in a basicillustration in:

FIG. 1 a deflection device in a first operational state,

FIG. 2 the deflection device of FIG. 1 in a second operational state,

FIG. 3 the deflection device of FIG. in a third operational state,

FIG. 4 the deflection device of FIG. 1 in a fourth operational state,

FIG. 5 a further deflection device in a rotor hasp, and

FIG. 6 a switch.

DESCRIPTION OF THE PREFERRED EMBODIMENT

According to FIG. 1 a deflection device comprises a drive device 1, 2with an upper drive roll 1 and a lower drive roll 2. The drive rolls 1,2 act on a metal strip 3 with an upper side 1 and an underside II, pullit out of a roll table 4, and transport it farther into an initial guidechannel 5.

The metal strip 3 is a thin metal strip with a strip thickness d ofmaximally approximately 3 mm. Since the metal strip 3 is hot, there isthe risk that it adheres to one of the drive rolls 1, 2 when it is nolonger under tension. In order to prevent such an adhesion to the driverolls 1, 2, the upper drive roll 1 is provided with an upper stripperbar 6 and the lower drive roll 2 with a lower stripper bar 7. By meansof the stripper bars 6, 7 the strip 3 is removed from the drive roll 1,2, respectively, should it adhere thereto.

The risk of adhesion of the strip 3 is present only when the metal strip3 is pushed by the drive rolls 1, 2 without being tensioned. Thestripper bars 6, 7 are therefore preferably adjustable relative to therespective drive rolls 1, 2 in order to effect the wear-causing removalonly when the metal strip 3 is pushed. As soon as tension is built up inthe metal strip 3 behind the drive rolls 1, 2, the stripper bars 6, 7are pivoted away from the drive rolls 1, 2.

The metal strip 3, as already mentioned, is transported by means of thedrive device 1, 2 out of the roll table 4 and is transported into theinitial guide channel 5. A hasp (not illustrated), by which the metalstrip 3 is wound, is arranged, for example, at the end of the channel.

What is claimed is:
 1. A deflection device for deflecting a strip (3, 8)from an initial guide channel (5) into a final guide channel (9)extending adjacent to the initial guide channel (5), wherein the strip(3, 8), when passing through the initial guide channel (5), has anunderside (II) facing away from the final guide channel (9) and an upperside (I) facing the final guide channel (9), wherein the deflectiondevice has a lower loading device (11) for loading the underside (II) ofthe strip (3, 8) with a medium (12), wherein the deflection device has adrive device (1, 2) with an upper drive roll (1) and a lower drive roll(2), wherein the upper drive roll (1) is acting on the upper side (I)and the lower drive roll (2) on the underside (II), wherein the lowerdrive roll (2) has a lower stripper bar (7) for removing the strip (3,8) from the lower drive roll (2), and wherein the lower loading device(11) is arranged on the lower stripper bar (7).
 2. The deflection deviceaccording to claim 1, wherein the medium (12) is compressed air or waterunder pressure.
 3. The deflection device according to claim 1, whereinthe lower stripper bar (7) can be advanced to the lower drive roll (2).4. The deflection device according to claim 1, comprising an upperloading device (13) for loading the upper side (I) of the strip (3, 8)with the medium (12).
 5. The deflection device according to claim 4,wherein the upper drive roll (1) has correlated therewith an upperstripper bar (6) for removing the strip (3, 8) from the upper drive roll(1) and in that the upper loading device (13) is arranged on the upperstripper bar (6).
 6. The deflection device according to claim 5, whereinthe upper stripper bar (6) can be advanced to the lower drive roll (1).7. The deflection device according to claim 1, wherein the initial guidechannel (5) and the final guide channel (9) are separated from oneanother by a switch (10) and in that the switch (10) has a rounded tip(15).
 8. The deflection device according to claim 7, wherein the tip(15) is pivotably supported.